基于Hypermesh 14.0和LS-DYNA的老年转子间骨折有限元建模分析

摘要

背景:目前运用有限元法分析股骨转子间骨折多局限于应力分布情况,多类型转子间骨折有限元断裂模型国内外未见报道.目的:运用Hypermesh 14.0及LS-DYNA模拟股骨近端侧方跌倒受力建立多型转子间骨折有限元断裂模型,评估模型效果,分析转子间骨折的力学发生机制.方法:选取1例单侧老年转子间骨折患者,获取健侧髋部CT影像资料,导入Mimics 19.0建立股骨近端几何模型,经Geomagic studio 2013光滑等处理,Hypermesh 14.0划分网格,设置材料参数,确定边界条件并赋予载荷参数,导入LS-DYNA求解器进行分析运算,在HyperView中查看运算结果.结果与结论:①股骨近端的应力分布情况与既往研究高度符合,在持续剪切应力作用下获得Evans Ⅰ型转子间骨折模型,调整载荷后共获取6型骨折模型;②结果发现,基于Hypermesh14.0和LS-DYNA的有限元法可以较好的模拟转子间骨折断裂情况,剪切应力在转子间骨折的发生中起重要作用,以上结论可为转子间骨折防治提供一定的实验参考.%BACKGROUND: At present, finite element analysis can be used to judge intertrochanteric fractures, but mostly limited in the distribution of stress. Finite element model of various intertrochanteric fractures has not been reported in detail.OBJECTIVE: To build various types of intertrochanteric fracture models with Hypermesh 14.0 and LS-DYNA software to simulate the falling-induced external force on proximal femur, and to evaluate the effect of models, and to analyze the biomechanical mechanism of intertrochanteric fractures. METHODS: Normal side CT image data of one case of elderly intertrochanteric fracture were collected and imported into Mimics software to establish the proximal femur geometric models, were then analyzed and operated by LZ-DYNA solver after imported into Geomagic studio 2013 and Hypermesh 14.0 for smoothing and meshing. Before analysis, the material parameters were set, the boundary conditions were confirmed, and given the loading parameters. The operating results were checked in Hyper View. RESULTS AND CONCLUSION: (1) The distribution of stress of proximal femur exactly matched to the previous study. EvansⅠtype intertrochanteric fracture model was obtained under continuous shear stresses, and six types of fractures were obtained by adjusting the load. (2) These results manifest that based on the Hypermesh 14.0 and LS-DYNA software, the finite element can well simulate the intertrochanteric fractures, and shear stress plays an important role in intertrochanteric fractures, which can provide experimental basis for the prevention and treatment of intertrochanteric fractures.